"We're going to be a multiple-front defense, but I think we'll make the commitment to the 4-3. The transition from the 3-4 to 4-3 is much easier than going from the 4-3 to 3-4, I will say that. So we feel pretty confident about that switch."

The Broncos had long run the 4-3 alignment under Mike Shanahan, but switched to the 3-4 under Josh McDaniels. Under the tutelage of then-defensive coordinator Mike Nolan, the Broncos appeared to make early strides in the odd man front in 2009, but the team dropped from the No. 7 ranked overall defense two years ago to dead last this past season.

Fox is fortunate in his timing. Not only are the Broncos in prime position to add a defensive star with the No. 2 overall pick of the draft, they'll also be getting former NFL sacks champion Elvis Dumervil back this season. He missed all of last year with a torn pectoral muscle.

Fairley, Alabama defensive tackle Marcell Dareus and Clemson defensive end Da'Quan Bowers each possess the size and strength to provide immediate help in Denver. The possibility also exists that the Broncos may have to consider LSU cornerback Patrick Peterson should they allow Champ Bailey to leave via free agency.

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